1) Don't devote much time to studying, and focus on companies that don't rely on whiteboarding leetcode-style interviews. They're harder to find, but they exist. FAANG probably isn't going to be an option, unless you get lucky.
2) Go all-in on studying. Make the time. Even an hour a day. Cut back on work and social obligations. Chip away at problems for several months. Keep track of the ones you get stuck on and re-do them a few weeks later. Try some practice interviews at sites like interviewing.io with real humans, and listen to their feedback. Repeat, repeat until you feel more confident. It takes time, but it pays off.